# MCQ for Class 11 Physics Chapter 3 Motion in a Straight Line with answer

MCQ for Class 11 Physics Chapter 3 : MCQs for Class 11 Physics Chapter 3 Motion in a Straight Line with Answers PDF Free Download prepared here according to the latest CBSE RBSE and Other State Board syllabus and NCERT Books.

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## MCQ for Class 11 Physics Chapter 3 Motion in a Straight Line with answer

Q1. A body is moving along a straight line path with constant velocity. At an instant of time the distance travelled by it is S and its displacement is D, then

a) D = S
b) D > S
c) D < S
d) None of these

a) D = S

Q2. The location of a particle has changed. What can we say about the displacement and the distance covered by the particle?

a) Neither can be zero
b) One may be zero
c) Both may be zero
d) One is +ve, other is –ve

a) Neither can be zero

Q3. The displacement of a body is zero. The distance covered

a) may or may not be zero
b) is not zero
c) is zero
d) depends upon the acceleration

a) may or may not be zero

Q4. The numerical ratio of displacement to distance for a moving object is

a) equal to or less than 1
b) always equal to 1
c) always less than 1
d) always more than 1

a) equal to or less than 1

Q5. Which of the following can be zero, when a particle is in motion for some time?

a) Displacement
b) None of these
c) Distance
d) Speed

a) Displacement

Q6. If distance covered by a particle is zero, what can you say about its displacement?

a) It must be zero
b) It cannot be zero
c) It may or may not be zero
d) It is negative

a) It must be zero

Q7. Which of the following is a one dimensional motion ?

a) Motion of train running on a straight track
b) Motion of satellite
c) Motion of air particle
d) Motion of snake

a) Motion of train running on a straight track

Q8. The distance travelled by a body is directly proportional to the time taken. Its speed

a) remains constant
b) decreases
c) increases
d) becomes zero

a) remains constant

Q9. The slope of velocity-time graph for motion with uniform velocity is equal to

a) zero
b) final velocity
c) initial velocity
d) none of these

a) zero

Q10. A boy starts from a point A, travels to a point B at a distance of 3 km from A and returns to A. If he takes two hours to do so, his speed is

(a) 3 km/h
(b) zero
(c) 2 km/h
(d) 1.5 km/h

(a) 3 km/h

Q11. A 180 metre long train is moving due north at a speed of 25 m/s. A small bird is flying due south, a little above the train, with a speed of 5 m/s. The time taken by the bird to cross the train is

(a) 10 s
(b) 12 s
(c) 9 s
(d) 6 s

(d) 6 s

Q12. A boy starts from a point A, travels to a point B at a distance of 1.5 km and returns to A. If he takes one hour to do so, his average velocity is

(a) 3 km/h
(b) zero
(c) 1.5 km/h
(d) 2 km/h

(b) zero

Q13. A body starts from rest and travels with uniform acceleration on a straight line. If its velocity after making a displacement of 32 m is 8 m/s, its acceleration is

(a) 1 m/s²
(b) 2 m/s²
(c) 3 m/s²
(d) 4 m/s²

(a) 1 m/s²

Q14. Which one of the following is the unit of velocity?

(a) kilogram
(b) metre
(c) m/s
(d) second

(c) m/s

Q15. A body starts from rest and travels for t second with uniform acceleration of 2 m/s². If the displacement made by it is 16 m, the time of travel t is

(a) 4 s
(b) 3 s
(c) 6 s
(d) 8 s

(b) 3 s

Q16. The dimensional formula for speed is

(a) T-1
(b) LT-1
(c) L-1T-1
(d) L-1T

(b) LT-1

Q17. The dimensional formula for velocity is

(a) [LT]
(b) [LT-1]
(c) [L2T]
(d) [L-1T]

(b) [LT-1]

Q18. A body starts from rest and travels with an acceleration of 2 m/s². After t seconds its velocity is 10 m/s . Then t is

(a) 10 s
(b) 5 s
(c) 20 s
(d) 6 s

(b) 5 s

Q19. The area under acceleration time graph gives

a) change in velocity
b) change in acceleration
c) distance travelled
d) force acting

a) change in velocity

Q20. If a body travels with constant acceleration, which of the following quantities remains constant ?

a) None of these
b) Time
c) Velocity
d) Displacement

a) None of these

Q21. Velocity time curve for a body projected vertically upwards is

a) straight line
b) ellipse
c) parabola
d) hyperbola

a) straight line

Q22. Two trains, each 40 m long are travelling in opposite direction with equal velocity 20 m/s. The time of crossing is

a) 1s
b) 2s
c) 3s
d) Zero

a) 1s

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